On 5 Mar, 23:16, "Clot" wrote:
Jon wrote:
On 4 Mar, 10:03, (Andrew Gabriel) wrote:
In article
,
Jon writes:

Hi,

We've got a bedroom above the garage in our eight year old house
which is always 5 deg C colder (or more) than the rest of the house
on cold days. The fact that the bedroom floor is always cold leads
me to believe the insulation requires significant improvement
between the garage ceiling and bedroom floor.

I've read these previous threads which seem sensible:

http://xrl.us/bg5jr(Linkto groups.google.co.uk)

and this:

http://xrl.us/bg5jt(Linktowww.diynot.com)

What I'd like to know is has anyone suffered with this cold room
above garage syndrome, improved the insulation, and actually fixed
the problem? If you have, can you state what you did and what
materials you used please? I can't pull up the flooring as we've
just had new carpet laid but would be prepared to pull down the
plaster ceiling if necessary.

Mine has fibreglass (looks like regular loft insulation)
in the gap. There's probably around 6" -- certainly it's
most of the 8" (IIRC) height of the joists. (That's a 1990
house.)

My parents recently had a single storey flat roofed extension
insulated. (Built in 1964, originally just foil backed board
and strawboard roof as insulation. Strawboard had been
replaced with ply.) I wasn't there, but I understand
they took down a strip of plasterboard along the centre
of the room perpendicular to the joists, and slid more
solid fibreglass bats along above the ceiling to the
edges. Ceiling was then repaired and the room was to be
decorated anyway.

I'm not too worried about the finish as the ceiling is only in the
garage. The trouble is there is already some poor quality loft
insulation in the void and I would have to get that out first before
putting in the rockwool, which could be a problem.

Nice idea about cutting out a strip of plaster though and pushing in
the new insulation. Removing all the plasterboard will be very messy
and I don't fancy it at all, but it needs must ....

Is the garage ceiling just plasterboard? Are the garage walls plastered? If
not with all the issues re the garage door, then are you getting a draft
distributed round the edges which funnel under the bedroom skirting around
the edge of the carpet? Are there also gaps around any pipework from the
garage into the ceiling space?

The garage ceiling is just plasterboard with no pipework going through
it, the walls are breezeblock. I was thinking of just screwing celotex/
kingspan under the plasterboard ceiling to save on a load of work.
Would that be acceptible and safe?

We had new carpet laid on monday in the room above the garage. Before
it was laid I ripped the old flooring up and sealed under the skirting
with silicone as well as any gaps in the floorboards which were
producing draughts.

Jon